Small cell foams and blends and a process for their preparation
Patent 5387617 Issued on February 7, 1995. Estimated Expiration Date: 
November 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 8, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDense star polymers having core, core branches, terminal groups Dense star polymer Dense star polymers and dendrimers Dense star polymers having two dimensional molecular diameter Rod-shaped dendrimer Patent #: 4694064 InventorsApplicationNo. 148440 filed on 11/08/1993US Classes:521/79, Extruding a solid polymer containing material to form a cellular product521/134, Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system521/139, At least one polymer is derived from an ethylenically unsaturated aromatic reactant or wherein the polymer-forming system contains the same type of reactant521/146, From aromatic reactant521/149, From oxygen containing reactant521/184Nitrogen reactant contains at least two amino nitrogen atomsExaminersPrimary: Foelak, MortonAttorney, Agent or FirmForeign Patent References
International ClassesC08J 009/00C08G 006/00 AbstractDense star polymers or dendrimers, modified by capping with a hydrophobic group capable of providing a hydrophobic outer shell, act as molecular nucleating agents. These modified dense star polymers or dendrimers are particularly effective for the production of small cell foams.Other References
Field of SearchExtruding a solid polymer containing material to form a cellular productNitrogen reactant contains at least two amino nitrogen atoms From aromatic reactant From oxygen containing reactant At least one polymer is derived from an ethylenically unsaturated aromatic reactant or wherein the polymer-forming system contains the same type of reactant Cellular product derived from two or more solid polymers or from at least one solid polymer and at least one polymer-forming system With organic amine, or from organic amine salt of a carboxylic acid With nitrogen-containing reactant | |
